Use data bind a value in a variable

Hi eveyrone.
Ejoying using wappler to build some amazing apps. I’m usually slow to ask but this has been bugging me and i can’t seem to find a solution.

I want to concatenate two dynamic values into a third value for databinding.
i.e.
{{val1}}.{{val2}} into something like {{val1.{{val2}}}}

The reason being val2 reads the browser language and then on concatenating with val1 to create the final value, loads the correct value from a json file.

A sort of dynamically assembled value or composite variable.

I have searched this forum extensively as well as Javascript documents but can’t seem to find the right thing…
Can anyone help please?
Many thanks;